/**
 * Copyright 2011 FeedDreamwork SIG
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package org.feeddreamwork.pubsubhubbub;

import java.io.*;
import java.util.*;

import org.feeddreamwork.*;

public final class PSHBUtils {
	private static final int HTTP_NO_CONTENT = 204;

	public static void subscribe(String feedURL) throws IOException {
		Utils.throwIfNullOrEmpty(feedURL);
		subUnsubImpl(feedURL, true);
	}

	public static void unsubscribe(String feedURL) throws IOException {
		Utils.throwIfNullOrEmpty(feedURL);
		subUnsubImpl(feedURL, false);
	}

	public static void publish(String feedURL) throws IOException {
		Utils.throwIfNullOrEmpty(feedURL);
		Map<String, String> publishInfo = new HashMap<String, String>();
		publishInfo.put("hub.mode", "publish");
		publishInfo.put("hub.url", feedURL);

		Utils.sendHttpPost(ApplicationProperty.HUB_URL, publishInfo,
				HTTP_NO_CONTENT);
	}

	private static void subUnsubImpl(String feedURL, boolean isSubscribe)
			throws IOException {
		Map<String, String> subscribeInfo = new HashMap<String, String>();
		subscribeInfo.put("hub.callback", ApplicationProperty.HOST_NAME
				+ "/callback");
		if (isSubscribe)
			subscribeInfo.put("hub.mode", "subscribe");
		else
			subscribeInfo.put("hub.mode", "unsubscribe");
		subscribeInfo.put("hub.verify", "sync");
		subscribeInfo.put("hub.topic", feedURL);

		Utils.sendHttpPost(ApplicationProperty.HUB_URL, subscribeInfo,
				HTTP_NO_CONTENT);
	}

	private PSHBUtils() {
	}
}
